Portable display device

1. A portable display device, comprising: at least two panel housings that have displays; a connection cable that electrically connects the panel housings to each other; an opening that is formed each of the panel housing and through which the connection cable passes; and a border in which displays are contiguous to each other when the panel housings are unfolded, wherein the two panel housings are joined so as to be folded and unfolded and the two displays are contiguous to each other with a clearance of within 2 mm to 3 mm when the panel housings are unfolded, wherein a protecting member mounted on the panel housings or a sidewall of the panel housing protects the sides of the displays in the border, wherein the sidewalls of the panel housings for protecting the sides of the displays in the border have a thickness less than 1 mm, and the protecting member have a thickness less than 1 mm, wherein even when the displays are unfolded and contiguous to each other, the sidewalls of the panel housings or the protecting members mounted on the panel housings are interposed between the displays, wherein the connection cable is drawn out of the panel housings through the openings, and wherein the connection cable electrically connects the panel housings to each other through the panel housings and a cover, which covers the sides of the displays when the panel housings are folded but does not cover the sides of the displays when the panel housings are unfolded.

2. The portable display device of claim 1 , wherein an optical member is disposed on the sidewalls of the panel housings in the border in which the panel housings are joined to each other.

3. The portable display device of claim 1 , wherein the displays are disposed on a mount or a chassis, and a side of the mount or the chassis is opened or is less than 0.5 mm in thickness in the border where the displays are joined together.

4. The portable display device of claim 1 , further comprising axes that serve as connection members when the panel housings are folded and unfolded, wherein recesses are formed on the panel housing so that the axes are mounted thereon, and the recesses are disposed at both edges of the display and are on the upper parts of the panel housing when the panel housing and the other panel housing are unfolded.

5. The portable display device of claim 1 , wherein the one panel housing is thicker than the other panel housing.

6. The portable display device of claim 5 , wherein a part in which the panel housings are folded is disposed more inside than the border at the edge of a main body part.

7. The portable display device of claim 1 , wherein an axis serving as the center of rotation is located at the connection axes, and two axes are disposed on both sides of the axis serving as the center of rotation.

8. The portable display device of claim 1 , wherein the axes and the panel housings are formed as an integrated body.

9. A portable display device comprising: at least two panel housings that have displays; a connection cable that electrically connects the panel housings to each other; a border in which the displays are contiguous to each other when the panel housings are unfolded; axes that serve as connection members when the panel housings are folded and unfolded; and, recesses that are formed on the panel housings, so that the axes are mounted thereon, wherein the two displays are contiguous to each other with a clearance of within 4 mm to 5 mm when the panel housings are unfolded, wherein protecting members mounted on the panel housings or sidewalls of the panel housing protect sides of the displays in the border, wherein the sidewalls of the panel housings in the border is thinner than the other parts of the panel housings or have a thickness less than 1 mm, and the protecting members have a thickness less than 1.5 mm, wherein even when the displays are unfolded and contiguous to each other, the sidewalls of the panel housings or the protecting members mounted on the panel housings are interposed between the displays, wherein the recesses are disposed at both edges of the display when the recesses are formed in the border of the panel housing, and the recesses are disposed on the upper part of the panel housing when the panel housing and the other panel housing are unfolded, and, wherein the axes include two axes, holes of the recesses and holes of the axes are disposed in a part where the recesses encounter the axes disposed close to the displays among the axes, and the connection cable connects the panel housings together through the holes and the two axes.

10. The portable display device of claim 9 , wherein the optical member is disposed on the sidewalls of the panel housings in the border in which the panel housings are joined to each other.

11. The portable display device of claim 9 , wherein the displays are disposed on a mount or the chassis, and a side of the mount or a chassis is opened or is less than 0.5 mm in thickness in the border where the displays are joined to each other.

12. The portable display device of claim 9 , wherein the holes of the two axes are disposed opposite to each other when the holes are formed on both the two axes in the part where the two axes encounter the recesses.

13. The portable display device of claim 9 , wherein the one panel housing is thicker than the other panel housing.

14. The portable display device of claim 13 , wherein a part in which the panel housings are folded is disposed more inside positioned than the border at the edge of a main body part.

15. The portable display device of claim 9 , further comprising a cover that serves to cover the sides of the displays when the panel housings are folded but not to cover the sides of the displays when the panel housings are unfolded.

16. The portable display device of claim 9 , wherein the axes and the panel housings are formed as an integrated body.